xenharmonic (microtonal wiki)

In 19-limit Just Intonation, all ratios in the system will contain no primes higher than 19.

19-odd limit Intervals

Ratio	Cents Value	Name
20/19	88.801	lesser undevicesimal semitone
19/18	93.603	greater undevicesimal semitone
19/17	192.558	undevicesimal whole tone ("meantone")
22/19	253.805
19/16	297.513	undevicesimal minor third
24/19	404.442	lesser undevicesimal major third
19/15	409.244	greater undevicesimal major third
19/14	528.687	undevicesimal acute fourth
26/19	543.015	undevicesimal superfourth
19/13	656.985	undevicesimal subfifth
28/19	671.313	undevicesimal grave fifth
30/19	790.756	lesser undevicesimal minor sixth
19/12	795.558	lesser undevicesimal minor sixth
32/19	902.487	undevicesimal major sixth
19/11	946.195
34/19	1007.442	undevicesimal minor seventh
36/19	1106.397	lesser undevicesimal major seventh
19/10	1111.199	greater undevicesimal major seventh